Spark-plug



L H. BECKER AND W. S. BELLOWS.

SPARK PLUG. APPLICATION FILED Ausura, 1917.

1,834,212, Patente Mar. 16,1920.

{MW/L 3 woe 144674,

8E", elite mag z CAD Wlttlll Application filed rlunuet lltl, tttllt. Elle;

citizen ct the United States, resiclin in the city of Philadelphia, county of Piiletlelphiu, and State of Pennsylvania, and WM:- em: b. iiELLOWS, u citizen or the United tltutcst residing in the cit ot llhn'cester county of VOI'CBSWL', and State of lllessh chueetts, have invented c ertztin new end ueet'ul improvements in tipurk-llugs, oi which the following isu specification.

(lhr invention relates to that type of spark plug which is provided with an interrupted electrode forming nu mixiliui'y spurt: grip located in an upertured core by means of which observation may be mucle and knowledge had oi the sparking; condition oi" the plug l One of the objects of our, invention is to improve structurally this type of plug by the :uldition o-tcertain features which greatly enhance the usetulnees and elliciency oi the plug generelly.

in carrying out our invention, we arrange the auxiliary gap and associated structunl in Such {L Way as to produce in eliect' the notion of an electricul con .len%e1' which increases; the voltage and decreases the unione terminal ot the gap loeing rid-- ily .uiouuted so as to very the character ,tilttllt produced the'reztt.

l in", which tonne one oi the v i may he ll'lildfi while the l in lll Active nee. l'n practice this n r, n tound to be oi particular ur l'vun n t in much en o}; observing; the/char 2155mot the spark :it the zruiriliery gap one may lei ow and determine the cluiructer ot the s mrlt illthe eh" ctive igniting; points oi the plug. shown tlizit e 'nlrke may he observed at the auxiliary grip when tie it mutter or feet no sparking is prctcnt at the active points of the plug due to the plug. hecom lug 't'ouled either by the accumulation 0t cerhoin oil or n Sllfilll circuit. lt lute been observed, thnt the current penning an linpreperly ntlju ted auxiliary cyup is purple in color and that in euch ii icce no leper-l1 is; being; produced at the inn ion points of the plug. lily properly adjusting the prep (lit tunce, the character hi this spurlt the}; he changed to such nu c1 that it will over- Specification ot' ltettcrt ."llutent.

W of our invention, we here For instance experience luur 6t, lllll llltlt Therefore, it ie manifest thut j; proritlin nreene tor con. veniently zuljusting' the 'iltlllttl'Y grep While the engine is rttiming the eilicien cy enol serviceuhility ot the plug; is greatly enhenceol ln the accompanying thuwingc we have illustretecl by Way of example uspurlr. plug embodying the features of our invention, in which Figure l is u" perepeetive View thereot. l lg. is at View in verticul croee section. Fig. 3 u longitudinal section tulten on line (ll--61, ot l 5.). V i

x t is a top plan View. lteterring to the chewing-e in detnil the plug comprises the, ueuul screw tlireuoleu bushing" 14, and e. centrally located porcelain core El, Wl'iiclimay he euitnhly tuetenetl in place by swerlging over the motel ell the bushing t5 at 3 into contact with the ehoul ler l termed upon the core. 'lThe central electrode is of two-pert co .etructiorn the lower pert indicated at 5 being etetionery While the upper pert 6 is edjuetehly mount ed, 'llhe other electrode of the plug is indicated at 7 and is of conventional term, The porcelain core, near the point Where the central electrode is located is provided with e series of rediully essocieted eperturee 8 serving ee wintlowe through which the spur-hing cherecterieti "e ot the plug niu y he observed, lhe upper ucljustiihle part out the central electrode is in ecreinthrcndetl en t ;elne'nt with u lnetel elceve t einheclcled pnrtlyin tli porceluin core '2, end portly in the cup 9 cl ineulet llflounted upon the upper entrel i L central electrode e ltnoh ll lay which cotwenient in without dunner oil shoclr.

l ietween and entirely surrounding the l o m tion of the core is u sheet Illti'llftl. pertorrtt tl screen lit in order to inuintein the erljuet ehle port ot the eentrel electrode securely at possible in adjusted position We provide a glaring locking ine: comprising en up werdly ettentling mend) i o'l spring nieterinl l t, the upper extremity of which it .ie inetel carp end the liue'hi it little an to the'knolo ll. While the lower extrem' ity engages the grooved member 15. a

It will be obvious that by rotati: the knob 11 the finger l4, owing to its springy nature will trip from groove to groove and when the proper adjustment is had between the auxiliary spark gap electrod s, such adjustment will be properly maintained. De taohably arranged with respect to the metal sleeve (3 surrounding the central electrode is a binding post 13 to accommodate the lead or Wire which supplies the ignition curis broken at bhoauxiliary spark gap. The

current is condensed in such a manner as to decrease the ain 'ierage and increase the vehage which produces a powerful, intense lg; niting spark capable of: firing spark plugs after they become carbonized and oil soaked and which could not be fired in ordinary manner iviehout the auxiliary gap. Furthermore plugs of our invention produce a better and more continuous and oven spark than plugs hitherto known, which means more even engine torque, greater flexibility, lPSs vibration, less bushing troub e and less wear and tear.

While we have illustrated and described certain structural details, We do not Wish lo be understood limiting ourselves precisely thereto as changes may be rcsorl ed to \vilh out departing from the spirit and scope ol our invention as defined by the appended claims by which We intend to cover the principles of our invention in Whatever "lorin they may be embodied.

Having thus described our invention \vhai we claim is:

l. A spark plug coiuprisiiu a two-purl electrode, one part beingrolaiahly and axiall adjusl'ahlc relatively to the other part lio obtain variable spark aps, a sun mounted insulating nieniber opla'abl v asso ciaicd with and exiending above the outer end of the adjustable part and i'oialubl iherewith, whereby adjuslnwnh oi the auxiliar gap may be accomplished while the plug is. electrically active wilhoul l'ezu of shock to (he operator and means whereby an ignition wire (an be (*lULillCilllIy' associalcd with ihe. adjustable uai'l below lhc insulah in; member.

A spark plug comprising a taro-park oleci n'idci one of which parts is rol aiahl) and axiall adjustable rclal'ivolv to file other of said parts. so as io lorzn au au:-:ili;u' spark gap, an iusulaiiua .Hlklllllltl' niouu'led upon the upper extremity oi the zuljuslahlc part and rotatable thermvibh. moans where by an ignition instriuuentalit) may be coin nr-zcicd lo the adjnsiablc purl; below the iii-- sulating' ineniben and a perl'orale l screen carried by the plug and surrouiulir the auniliar gap to proiecf agaiusi ignition of gases or oil and at lhc lllli time lo peruiii ol'vservai'ion of The auxiliary sparl; during} zuljusl nieni while (he plug is elociricaily active.

s arl; ulna conin'i. a central electrode formed in two par? one ol said parts being" rolaiiahle and axially adjusiablc rclativel lo the other purl lo provide an auxiliar spark gap, an insulating; hnoh fixedly applied to the upper Ol lblhlllii) ol' The adjusi'ablc part, means as oeaied with the adjustable. part, and a suuionary part of the plug for accomplishing a slep-bv slop :uljusrinent of the adjuraiable part; of the electrode and holding it in adjusted positimn and means electrically :i 'ooiai 0(l will: Llu' adjusluble electrode pare i'ifllli' lliill the insulai'iug knob for conuec-Liiig an igrnilion wire o ihe plug.

JOHN ll. lidClilFl- 5? lll lii-iillli l o, A n ill-hill 

